[Q] N7000 - CM10.1 nightlies after 8Jan13 won't mount sdcard0.

Any CM10.1 nightly up to and including 8Jan13 mounts sdcard0 just fine; any one produced after that apparently doesn't see it. Storage manager, et. al. can't see it, can't get to it via CLI, etc.

Since CM10.1 up to and including 8Jan13 mount sdcard0 just fine, I'm assuming that the hardware and the partition table are fine.

This is a real mystery to me, clue welcome - thanks!